Power-hammer.



Nq. 765,020. PATBNTED JULY 12, 1904.

C. LEONHARDT.

POWER HAMMER.

APPLICATION FILED MAY 29.1903.

N0 MODEL. 2 SHEETS-SHEET I. Il

No. 765,020. PATENTBD JULY 12, 1904.

' '0.'LB0NHARDT- l POWER' HAMMER.

APPLICATION FILED MAY'ZS. 1903.

N0 MODEL. 2 SHEETS-SHEET 2.

Fllf/- 7a) ttoz.-

UNITED STATES' Patented July 12, 1904.y

.PATENTv OFFICE.d

' CHARLES LEoNHARmg, or NEW` ULM, MINNESOTA.

POWER-HAMMER.

SPECIFICATIONforming part of Letters Patent No.`765,020, dated July 12, applicati@ sie@ May 29, 190s. sein n. 159,325; (No man.) n

i To tl whom it may concern:

` .Be it known that I, CHARLES LEoivHARDT', a

' citizen of the United States, residing at New Ulm, in the county of Brown'and State of Minnesota, have invented a new and useful. Improvement in Power-Hammers, of which the following is a specification.

v My invention relatesto an improvement in power-hammers; and theprimary object is to produce a power-hammer which can be quickly t and accurately 'gaged'to accommodate metals of various thicknesses, this adjustment being lowers the-walking-beam and hammer of the machine atl the will ef the operator by a sim- 'ple turning ofa crank which is geared to ope inside of the hammer erate a screw.

.Another-object is to provide an improved method of shaping and constructing thehammer itself -and a new means of fastening the hammer to the walking-beam, as well as a new and improved arrangement ofsprings'located proper, whereby to 'accomplish the results'desired., y

My invention still further consists, in connection with these objects, in certainnovel features of construction and combinations of parts, which will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a View in side elevation, parts being broken away. Fig. 2 isa'view in the power hammer.

v the vtrunnions a a,

rear elevation, and Figs. 3 and 4 are details.l t

A represents thev -frame of .the machine, which is preferably cast in one piece and af# fords support for various operative vparts of A walkingbeam 1 is fulcrumed in the pillow-block 6 byxnens of and the'boXes .7 are bolted down securely to thet'runnions of. the -walking-A beam in their bearings, as indicatedin the drawings.- The pillow-block and boxes aretted in the guideways B B, "at the topA of the frame, wherein `they are.vertically/.adjustable by means of thescrew 8, which is swiveled in the half-box 9, bolted to the `frame, and 'stepped' at its lower end in box 11. This screw turns in the threaded bore c of the pilloweb lock, andconsequently when the screw is tjrned tothe right .the

.adjustment being' ter spring 4is mounted g i posedbetween the head d and the cap e, this cap being provided on the under, side with ashoul- 80V the pillow-block to retain will be 'readily understood that when the ma'- pillow-block e is raised, carrying with ilth'e walking-beam 1, and when turned to the left these parts are lowered, the extent of vertical limited only by the length oi' the screw. As a simple means lfor accom- 5 plishing this vvertical adjustmentl Ioi the walk? ing-beam a bevel-pinion 10 is keyed or othe wisesecured to the lower end of the screw A vertically.- disposed pinion 12, secured o; Y

the shaft 14, intermeshes with this pinion 10 60 and transmits motion' to it when the shaft 14 is turned, a crank 15 being provided for that purpose and the shaft 14 being `supported in the bracket 13, whichlatter is secured to the main frame of the machine.

A rod or pitman 2 is adjustably connected with the forward end of the walking-beam at i its upper end, its lower end being connected n", with the hammer.v i

. The numeral 5 indicates the hammer, whichi7o may be in the form of a cylinder or, as shown in the present instance, in the form of a parallelopiped -hollowed out inthe interior to'accommodate the two hi ghtensioned-spiral springsB Y nterposed be-A .7.5

and 4, the former` of which isili tween the inner end of the ham mer and the head on thelower. end of rod 2,whereas-.the laton saidrod and interder f, which engagesand holdslthe spring4- in place. The hollow interior of thehammer is preerablytapered'rom top tobottom, as

shown, the chamber having its greatest diams eter at the top, whereby to permit a-slight 85Av swinging movement of the pitrnan 2 therein and a corresponding moveine'r'itof lthe springs as they follow'the movement of the pitman. In the top of the .cap` is anv oblong through which the connecting-rod 2 operates. 9,0 The cap visfastened in place by means of bolts hole g,

h it and nuts screwed thereon. When the cap' is thus bolted down,it'at the same 4time compresses the, springs to ahigh tension. It v chine is working thesprings 3 and 4 will au'- tomaticallyadjust the hammerto -a limitedg extent to the thickness ofthe material which is being operated upon. In the case ofthicker l material being operated upon the springs will( 10,

give more in proportion and when thinner materials are being hammered they will give proportionately less. This hammer 5 reciprocates in a guide-box 1G, provided therefor and bolted in position to the front face of the machine.

The length of strokes is regulated by the adjustment of the end 18 of pit-man17 in and out from the center of crank-wheel 19 by means of a sliding bolt which can be adjusted by a simple turning of the nut at any point between the center of the wheel and the outerl edge thereof. It will be understood that the nearer the connection is to the center of the wheel the shorter will be the stroke and the nearer it is set to the outer edge of the wheel the longer will be the stroke. The limit of adjustment will depend entirely on the diameter of the crank-wheel 19. The shaft 20, upon which crank-wheel 19 ismounted, is driven by a belt through pulley 2 1 and a clutch Q1' is designed to be operated by the treadle 23 to clutch or unclutch pulley 21 with rela tion to the shaft, whereby to start or stop the hammer. A bracket 22 supports the outer end of shaft 20.,

1t is hardly necessary to repeat the operation; but it may be briefly stated that when the operator desiresl to raise the hammer to accommodate'metals of greater thickness it is done by turning' the crank 15 to the right.I

By reyersineT it the hammer is lowered through the bevel-gears 1'2 1l) and screw tl, the pillowblock tacontrollcd therel)Agema-ying the wall(- ing-beam and the walking-beam the hammer.

Thus a simple and at the same time powerl'ul mechanism for the accomplishment of the purposes sought is provided.

It is evident that slight changes -ini'ghtbe I resorted to in the form andarrangementof the severalparts described without departing" rotating; the screw whereby to move the sleeve upon the screw.'

2. The combination with a frame having guides, a pillow-block movably received on the guides, and a walking-beam supported by the pillow-block, of a threaded sleeve connected to the pillow-block, a swiyeled screw engaging the threads of the sleeve, means for rotating the screw whereby to move the sleeve upon the screw, a spring-cushioned hammer connected with one end of the walking-beam, a pitman connected with the other end, a driveshaft and means for adjusting the pitman radiallywith respect to the drive-shaft whereby to vary the stroke of the walking-beam.

ln testimony whereof l have signed this specilicationin the presence of two `subscribinev witnesses.

CHARLEs LEoNHAan'r.

ll'itnesses:

Jouxv W. Boocu, ll, l". linnn. 

